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Spring 2017


Chewing Damage on Buds and Young Shoots in Grapevines

This spring we have received numerous calls and photos of insect damage on buds and emerging shoots. Feeding damage includes the following:

  • a hole or a depression in an unopened bud
  • holes of various sizes inside the margins of a leaf blade
  • leaves that are misshapen due to marginal feeding
  • young shoots that are missing a shoot tip or entire leaf blades.

This is a brief guide of a few of the most common chewing insects found in early spring and the damage they cause.


WineFlavor 101C: Recognizing Non-Microbial Taints

Presented by: UC Davis Viticulture and Enology Extension

  • Date: Thursday, May 18, 2017
  • Time: 9 am to about 4:00 pm
  • Location: UC Davis
  • Fee: $200.00 Includes continental breakfast, lunch, tastings and handouts
  • Program agenda

Pre-registration is required

IMPORTANT: The WineFlavor Seminars are targeted specifically to wine and winegrape industry professionals and, as such, are technical in nature. 

For more information, email klbogart@ucdavis.edu

Updated List of Diagnostic Laboratories

2017 Selected Plant and Soil Laboratories in Northern and Central California

General Permit for Vineyard Properties in the Napa River and Sonoma Creek Watersheds

On April 12, 2017 an informational workshop was held to discuss the draft General Waste Discharge Requirements for Vineyard Properties in the Napa River and Sonoma Creek Watersheds (General Permit). The draft General Permit is being proposed by the San Francisco Regional Water Quality Control Board (Water Board). Prior to the informational workshop, it was anticipated that the General Permit would be considered for adoption at the June or July 2017 Water Board Meeting.

Owners or operators of Vineyard Properties (located in the two watersheds) discharging, or proposing to discharge waste from a Vineyard Property are “dischargers.” The General permit will regulate discharges from vineyard properties that meet specific criteria.

Water Board staff prepared a report for the workshop consisting of a summary of comment letters from the public and the staff’s responses to the comments. The staff report also briefly describes the actions required to control discharges which include sediment and storm runoff from vineyards, unpaved roads located on the vineyard properties, pesticides and nutrients.

For complete information on the Napa River and Sonoma Creek Vineyard Program, including the draft General Permit and Draft EIR, visit the Water Board’s website.